/Engine/Source/Runtime/AnimationCore/Public/BoneWeights.h
Blend two bone weights together, making sure to add in every influence from both, using the given settings. The bias value should lie on the [0,1] interval. Values outside that range may give unwanted results.
static [FBoneWeights](API\Runtime\AnimationCore\FBoneWeights) Blend ( const [FBoneWeights](API\Runtime\AnimationCore\FBoneWeights) & InA, const [FBoneWeights](API\Runtime\AnimationCore\FBoneWeights) & InB, float InBias, const [FBoneWeightsSettings](API\Runtime\AnimationCore\FBoneWeightsSettings) & InSettings )